Re: Approval flow email view not change after approval.
Sorry for the confusion - unfortunately, the content inside of an Approval email cannot be updated after the approval completes (either approved or denied). That is because the content of the email is generated when the flow runs, and cannot dynamically change inside of the mailbox.
With the new Modern Approvals experience, the approval state is stored in the Approval Center. As a result, whenever the user clicks the link inside of the email, it will bring them to the approval center where they will no longer see the approval request if it were already completed.
When doing approvals with Flow, we now recommend the use of Modern Approvals wherever possible. Hope that helps!